JP2000293878A - Optical pickup examining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an examination at an optimum relative angle by attaching a motor for examination to a base oppositely to a spindle motor for rotating an information recording medium, and arranging a medium for examination in a reproducing or recording enable direction to the motor exclusively for examination. SOLUTION: Two axes of a movable supporting means 1:1 is displaced for a certain unit by tilting to a motor (spindle motor) 10 for examination, to which a medium 12 for examination is mounted, information on the medium 12 for examination is reproduced at each displaced angle by an optical pickup 3 and the state of that signal is observed. Since the relative positions of the motor 10 for examination and the optical pickup 3 are opposite to ordinary ones, even when the motor 10 for examination is attached oppositely, the information on the medium 12 for examination can be reproduced correct by the optical pickup 3. Besides, the spiral direction of arranging the information on the medium 12 for examination by rotating the motor 10 for examination oppositely to a motor 8 for examination can be set as ordinary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for condensing light on a disc-shaped information recording medium on which information is recorded and reproducing the information from reflected light from the information recording medium, or an information reproducing apparatus. In a recording / reproducing apparatus for recording information by condensing light on a recordable disk-shaped information recording medium, an optical component for irradiating the medium with light or receiving reflected light, and an information recording medium The present invention relates to an optical pickup inspection device for inspecting an optical pickup module in which a motor for rotating the optical pickup is assembled.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of an optical pickup module 1. FIG. FIG. 4 is a plan view, and FIG. 5 is a front view thereof. It should be noted that here, only necessary portions are extracted and simplified. An optical pickup 3 on which optical components such as an objective lens 2 are mounted is provided movably in a radial direction of an information recording medium 5 along a seek rail 4. The seek rail 4 is fixed to the base 6. Reference numeral 7 denotes a chucking portion for holding the information recording medium 5 on the tip of a spindle motor 8 for driving the information recording medium 5 to rotate. The spindle motor 8 is mounted on a base 6.

FIG. 6 is an enlarged front view showing a circle A in FIG. In this optical pickup module 1, the relative angle between the optical pickup 3 and the information recording medium 5 (1
Due to the parallelism between the dashed-dotted lines B and C), the shape of the spot of the light that should have been focused on the information recording medium 5 becomes elliptical, and the reproduced signal is deteriorated as compared with the case where there is no mounting angle.

Therefore, the inspection items of the optical pickup include:
There is an inspection item for changing the relative angle between the information recording medium 5 and the optical pickup 3 to detect which relative angle is best for the reproduction signal, and inspecting whether the angle is within the standard range. Alternatively, a recordable information recording medium 5 (each of a write-once type that can be written only once, and a type that can be recorded multiple times)
The recording quality is inspected by performing the recording operation while changing the relative angle in the above manner, and reproducing the information recording medium 5 of the recording result.

Conventionally, this inspection is performed on the optical pickup alone. For example, JP-A-6-24
According to Japanese Patent No. 3478, etc., in a lens tilt inspection apparatus for adjusting the tilt of an objective lens actuator in an optical pickup assembly process, the spot inspection process can be automated by quantifying the amount of lens tilt.

[0006]

However, in practice,
Since the relative angle between the optical pickup 3 and the information recording medium 5 becomes a problem, the inspection for confirmation is performed again by the optical pickup module 1 in which the optical pickup 3 and the spindle motor 8 are combined. This is because if the spindle motor 8 is fixed to the base, the information recording medium 5 cannot be tilted.

Accordingly, the present invention provides an optical pickup capable of detecting in which relative angle a reproduced signal is best and checking whether the angle is within a specified range in an optical pickup module state. It is an object to provide an inspection device.

[0008]

According to the first aspect of the present invention,
For an optical pickup module in which optical components of an optical pickup for reproducing or recording information on an information recording medium and a spindle motor mounted on a base and rotating the information recording medium are assembled, the spindle motor is An inspection motor mounted on the base in an opposite direction, and an inspection motor which is disposed in such a direction as to be capable of being reproduced or recorded by the optical components of the optical pickup with respect to the inspection motor and is driven to rotate by the inspection motor. And a movable support means for tiltably supporting the inspection motor with respect to the optical pickup module in at least one of a radial direction and a direction orthogonal to the radial direction of the information recording medium.

Therefore, the tilt inspection, which cannot be performed by the spindle motor included in the optical pickup module, is performed by using another inspection motor that is tiltably supported by the movable support means. This is possible in the state of the module.

According to a second aspect of the present invention, in the optical pickup inspection apparatus according to the first aspect, the direction of the spiral shape for arranging information on the inspection medium is opposite to the direction of the spiral shape on the information recording medium. .

Accordingly, by setting the direction of the spiral shape for arranging the information on the inspection medium to be opposite to the direction of the spiral shape on the original information recording medium, the information can be correctly obtained by the optical pickup even if the inspection motor is reversed. Can be played.

According to a third aspect of the present invention, in the optical pickup inspection apparatus according to the first aspect, a rotation direction of the inspection motor is opposite to a rotation direction of the spindle motor.

Therefore, by setting the rotation direction of the inspection motor to be opposite to the rotation direction of the spindle motor, the inspection motor is reversed, and information can be correctly read by the optical pickup using the original information recording medium as the inspection medium. Can be played.

According to a fourth aspect of the present invention, in the optical pickup inspection apparatus according to the first, second or third aspect, the direction of writing information on the inspection medium is opposite to the direction of writing information on the information recording medium. .

Accordingly, by setting the direction of writing information on the test medium to be opposite to the direction of writing information on the information recording medium, the control direction of the optical pickup module can be maintained as before.

According to a fifth aspect of the present invention, in the optical pickup inspection apparatus according to the first, second or third aspect, the polarity of the control means for the optical pickup module is changed when the medium for inspection is used. With respect to the polarity of

Therefore, when the test medium is used, the polarity of the control means for the optical pickup module is inverted with respect to the polarity at the time of use of the information recording medium, so that the optical pickup using the original information recording medium as the test medium is used. Information can be reproduced more correctly.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 4 to 6 are denoted by the same reference numerals, and description thereof will be omitted. First, a spindle motor 10 serving as an inspection motor is attached to a base 9 on which the optical pickup module 1 is mounted via a movable portion 11 serving as a movable support means. Here, the spindle motor 10 is mounted downward so as to be parallel to and opposite to the spindle motor 8 in the optical pickup module 1. Further, the movable portion 11 is rotatable (tiltable) in a certain unit in two axes, here, in the radial direction of the information recording medium 5 and in a direction orthogonal to the radial direction. At the lower end of the spindle motor 10, the inspection medium 12 is mounted downward with respect to the optical pickup 3 so as to be in the same direction as the normal information recording medium 5.

In such a configuration, at the time of inspection / evaluation, the two axes of the movable portion 11 are tilt-displaced by a certain unit with respect to the spindle motor 10 on which the inspection medium 12 is mounted instead of the information recording medium 5. The information on the inspection medium 12 is reproduced by the optical pickup 3 for each of the displaced angles, and the state of the reproduced signal is observed. As a method of evaluating the reproduction signal, a temporal variation of the reproduction signal generally called “jitter” can be used. The angle at which the jitter shows the best measurement result at the end of each measurement in the two axis directions indicates a relative angle shift. Therefore,
It is sufficient to evaluate whether or not this angle is within a preset specified value.

As described above, according to the present embodiment, the tilt inspection which cannot be performed by the spindle motor 8 included in the optical pickup module 1 is performed by the separate spindle motor 10 supported by the movable portion 11 so as to be tiltable. Is used, the optical pickup module 1 mounted on the base 9 can be kept as it is.

In the present embodiment, the relative position between the spindle motor 10 and the optical pickup 3 is
Since the direction of the spiral shape for arranging the information of the normal information recording medium 5 is, for example, the direction as shown in FIG. Figure 2 shows the orientation of the spiral shape for arranging information.
The direction is reversed as shown in FIG. This allows
Even if the spindle motor 10 is reversed, the optical pickup 3
Thereby, the information on the inspection medium 12 can be reproduced correctly.

However, as a modification, if the spindle motor 10 is rotated in a direction opposite to that of the spindle motor 8, the direction of the spiral in which the information of the test medium 12 is arranged may be normal. That is, the spindle motor 1
Even if 0 is reversed and the original information recording medium 5 is used as the inspection medium 12, the information can be correctly reproduced by the optical pickup 3.

The normal information recording medium 5 is shown in FIG.
As shown in FIG. 3, information is recorded from the inner circumference to the outer circumference (the writing direction is set from the inner circumference to the outer circumference). Therefore, the writing direction to the inspection medium 12 is shown in FIG. By setting the direction opposite to the outer side from the outer side as described above, the control direction for the optical pickup 3 can be kept as usual.

However, when the inspection is performed using the inspection medium 12, if the polarity of the control means (not shown) for the entire optical pickup module 1 is reversed with respect to the normal case, the inspection The information can be correctly reproduced by the optical pickup 3 using the original information recording medium 5 as the medium 12 as it is.

[0025]

According to the first aspect of the present invention, a tilt inspection which cannot be performed by the spindle motor included in the optical pickup module can be performed by using another inspection motor which is supported by the movable supporting means so as to be tiltable. By using the optical pickup module, it can be performed in the state of the optical pickup module mounted on the base.

According to the second aspect of the present invention, the direction of the spiral shape for arranging the information on the inspection medium is opposite to the direction of the spiral shape on the original information recording medium, thereby mounting the inspection motor reversely. Even so, information can be correctly reproduced by the optical pickup.

According to the third aspect of the present invention, the rotation direction of the inspection motor is made opposite to the rotation direction of the spindle motor, so that the inspection motor is reversed and the original information recording medium is used as the inspection medium. The information can be correctly reproduced by the optical pickup using the optical pickup.

According to the fourth aspect of the present invention, the direction of writing information on the test medium is opposite to the direction of writing information on the information recording medium, so that the control direction on the optical pickup module remains the same as before. can do.

According to the fifth aspect of the present invention, when the test medium is used, the polarity of the control means for the optical pickup module is inverted with respect to the polarity at the time of use of the information recording medium. The information can be correctly reproduced by the optical pickup using the information recording medium.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a direction of a spiral shape in a medium.

FIG. 3 is a schematic plan view showing a writing direction on a medium.

FIG. 4 is a plan view showing a conventional example.

FIG. 5 is a front view thereof.

FIG. 6 is an enlarged front view showing a portion A in FIG. 5;

[Explanation of symbols]

 Reference Signs List 2 optical component 3 optical pickup 5 information recording medium 8 spindle motor 9 base 10 inspection motor 11 movable support means 12 inspection medium

Claims (5)

[Claims] 1. An optical pickup module in which optical components of an optical pickup for reproducing or recording information on an information recording medium and a spindle motor mounted on a base and rotating the information recording medium are assembled. An inspection motor attached to the base in a direction opposite to the spindle motor; and an inspection motor arranged in a direction that can be reproduced or recorded by the optical components of the optical pickup with respect to the inspection motor. A rotationally driven inspection medium; and a movable support means for supporting the inspection motor with respect to the optical pickup module in a tiltable manner in at least one of a radial direction or a direction orthogonal to the radial direction of the information recording medium; An optical pickup inspection device comprising: 2. The optical pickup inspection apparatus according to claim 1, wherein the direction of the spiral shape for arranging the information on the inspection medium is opposite to the direction of the spiral shape on the information recording medium. 3. The optical pickup inspection apparatus according to claim 1, wherein the rotation direction of the inspection motor is opposite to the rotation direction of the spindle motor. 4. The optical pickup inspection apparatus according to claim 1, wherein the direction of writing information on the inspection medium is opposite to the direction of writing information on the information recording medium. 5. The method according to claim 1, wherein the polarity of the control means for the optical pickup module is inverted with respect to the polarity when the information recording medium is used when the test medium is used.
4. The optical pickup inspection device according to 2 or 3.